Respuesta :

whk09343

Answer:

1) 37

2) 60

3)115

Step-by-step explanation:

ronhagrid310

Answer:

Fig.1  20

Fig.2 45

Fig.3 115

Step-by-step explanation:

Fig.1

ABC+CBD=57

CBD+17+CBD=57

=> CBD = 20

Fig.2

By observing only: 2x = 90

Then x = 45

Fig.3

x+x+50=180

=>x=65

=> Angle 4 = Angle 3 = 180-65=115

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